This one, sitting in wet pasture in County Limerick, does almost the opposite. It does not appear on any historic Ordnance Survey Ireland maps. It was invisible in aerial photography taken between 2005 and 2013. It exists, so far as the record goes, because a single survey flight caught it at the right angle in the right light in 1986, and because a Google Earth image taken on 18 November 2018 shows it, faintly, once more. What lies in between is largely silence.

The enclosure was tentatively identified during the Bruff aerial photographic survey of 1986, recorded as Bruff 103 (AP 4/3672). The survey photograph suggested a roughly circular enclosure with external dimensions of approximately 42 metres north to south and 48 metres east to west. A circular enclosure of this kind, defined by a bank and ditch, would typically belong to the early medieval period in Ireland, and the surrounding landscape supports that reading. A second enclosure sits around 20 metres to the north-east, and the ringfort known as Rathaniska lies just 35 metres to the east-south-east. Ringforts, which were enclosed farmsteads usually dating from roughly the sixth to the twelfth centuries, are among the most common archaeological monuments in Ireland, and Ballynaclogh sits within a cluster of such features that suggests the area was actively settled during that period. The site itself was compiled in the archaeological record by Edmond O'Donovan and uploaded in September 2020.

The enclosure lies 10 metres south of the townland boundary with Ballyhurst and 15 metres west of the boundary with Ballyshoneen, placing it in a corner of the landscape that is easy to overlook. The wet pasture setting means the ground can be soft underfoot, particularly in the wetter months, and there is nothing visible at ground level to reward a casual inspection. What gives the site its peculiar interest is precisely the difficulty of seeing it at all. The faint trace on the November 2018 Google Earth image is the kind of thing that requires knowing what to look for, and even then it asks for patience. For anyone drawn to the archaeology of early medieval settlement in the Bruff area of County Limerick, the site is worth knowing about for what it represents, even if the landscape itself gives almost nothing away.